Review on Bike Tail Light USB Rechargeable - Super Bright LED Rear Bicycle Light Clip On for Enhanced Cycling Safety - 6 Lighting Modes by Mike Carter

Exactly what I was looking for! My bike has an aero seat post which is much longer than a regular seat post so it took some research to find a compatible seat post mounted tail light. To complicate things further, I also have bottle cages that attach to the seat rails. This made some of the seat rail mounted taillights incompatible. This taillight was exactly what I needed. There were many rubber bands included with the taillight. As you can see from my photos I folded 2 large pieces of ribbon in half and it was the perfect length to wrap around the seatpost. This rear light fits perfectly behind the seat post, so there is no additional wind resistance and bottles do not get in the way. Very happy with this attitude!